%I #12 Oct 25 2019 16:52:43
%S 1,3,8,23,55,144,328,816,1808,4358,9485,22377,48097,111720,237917,
%T 546161,1154827,2626624,5522464,12467540,26092324,58546544,122059348,
%U 272479782,566242186,1258568324,2608232758,5775620396,11940756076
%N a(n) = Sum_{k=0..n} (k+1) * A026725(n, n-k).
%p A027212 := proc(n)
%p add( (k+1)*A026725(n,n-k),k=0..n) ;
%p end proc: # _R. J. Mathar_, Oct 21 2019
%K nonn
%O 0,2
%A _Clark Kimberling_
%E Name corrected by _R. J. Mathar_, Oct 21 2019